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Arroyo Seco, nestled within the province of Santa Fe, Argentina, occupies a geographically significant position within the Paraná River basin. Located at approximately -33.1667° latitude and -60.5000° longitude, the city’s terrain is characterized by gently rolling plains, typical of the Pampa biome, transitioning subtly towards the Mesopotamian grasslands. Its elevation, relatively low at around 80 meters above sea level, contributes to a tendency for stagnant air conditions, particularly during certain times of the year. Arroyo Seco sits within a predominantly agricultural region, surrounded by fertile farmlands dedicated to soybean, wheat, and maize cultivation – a crucial factor influencing regional air quality. The Paraná River, though not directly adjacent, exerts a moderating influence on the local climate and can occasionally contribute to humidity and fog formation. The urban–rural gradient is gradual; the city blends seamlessly into the agricultural landscape, with smaller settlements and farms visible within a short distance. There are no major industrial belts immediately surrounding Arroyo Seco, though regional processing plants for agricultural products exist further afield, potentially impacting air quality through transport emissions and occasional fugitive releases. The surrounding landscape is largely flat, offering limited topographical barriers to pollutant dispersion, which can exacerbate localized air quality issues. The city’s position within the wider Paraná River basin means it is susceptible to regional weather patterns and transboundary pollution events.

Arroyo Seco’s air quality experiences a distinct seasonal cycle dictated by the region’s subtropical climate. The warmer months, typically December to February, are often characterized by increased temperatures and reduced rainfall, leading to a build-up of pollutants. Stagnant air masses, common during this period, prevent effective dispersion, potentially resulting in elevated concentrations of particulate matter and ozone. The dry conditions also increase the risk of dust storms originating from agricultural fields, further degrading air quality. Conversely, the cooler, wetter months (June to August) generally see improved air quality due to increased rainfall, which naturally scavenges pollutants from the atmosphere, and more frequent wind events that facilitate dispersion. Spring (September to November) can be variable, with periods of calm weather interspersed with stronger winds, leading to fluctuating air quality. Autumn (March to May) often brings a gradual improvement in air quality as temperatures cool and rainfall increases. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the warmer, drier months, limiting strenuous outdoor activity during peak sunlight hours. Agricultural practices, such as burning crop residue (though increasingly regulated), can contribute to localized pollution episodes, particularly during the transition periods between seasons. Fog, common during cooler months, can trap pollutants near the ground, creating localized air quality concerns. Awareness of regional weather forecasts and agricultural activity is key to minimizing exposure.